[ALSA] use PCM interface for IEC958 controls

Digigram VX core,ENS1370/1+ driver,CA0106 driver,EMU10K1/EMU10K2 driver
RME HDSP driver,RME9652 driver
For consistency, use the PCM interface instead of MIXER for IEC958
default/mask/stream mixer controls.

Signed-off-by: Clemens Ladisch <clemens@ladisch.de>
diff --git a/sound/drivers/vx/vx_mixer.c b/sound/drivers/vx/vx_mixer.c
index f00c888..19fc68c 100644
--- a/sound/drivers/vx/vx_mixer.c
+++ b/sound/drivers/vx/vx_mixer.c
@@ -796,14 +796,14 @@
 
 static snd_kcontrol_new_t vx_control_iec958_mask = {
 	.access =	SNDRV_CTL_ELEM_ACCESS_READ,
-	.iface =	SNDRV_CTL_ELEM_IFACE_MIXER,
+	.iface =	SNDRV_CTL_ELEM_IFACE_PCM,
 	.name =		SNDRV_CTL_NAME_IEC958("",PLAYBACK,MASK),
 	.info =		vx_iec958_info,	/* shared */
 	.get =		vx_iec958_mask_get,
 };
 
 static snd_kcontrol_new_t vx_control_iec958 = {
-	.iface =	SNDRV_CTL_ELEM_IFACE_MIXER,
+	.iface =	SNDRV_CTL_ELEM_IFACE_PCM,
 	.name =         SNDRV_CTL_NAME_IEC958("",PLAYBACK,DEFAULT),
 	.info =         vx_iec958_info,
 	.get =          vx_iec958_get,